The ZFS filesystem has a theoretical volume size limit of about 256 quadrillion zebibytes.[4]

In late 2017, commercial internal hard drives for the consumer PC market were available up to about 10 to 12 TB (as single drives, multiple drive arrays with higher total capacity are also available, generally as external devices). The available information storage of 1 ZiB is therefore equivalent to approximately 100 million of the largest hard drives available on consumer PCs.

Estimates are extremely rough, but as of 2015, it was estimated there were 7-8 Zebibytes of data stored throughout
the whole earth.[5]